import jakarta.servlet.ServletContext;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Properties;

public class ContextServletTest  extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out =response.getWriter();
        ServletContext context= this.getServletContext();
        InputStream stream = context.getResourceAsStream("/WEB-INF/classes/jdbc.properties");
        Properties properties = new Properties();
        properties.load(stream);
        String dbNmame = properties.getProperty("dbName");
        String userName = properties.getProperty("userName");
        String userPassword = properties.getProperty(" userPassword");
        String url = properties.getProperty("url");
        url = url + dbNmame + "?userName=" + userName + "&password=" + userPassword;
        try{
            Class.forName("com.mysql.jdbc.Drive.jc");
            Connection conn = DriverManager.getConnection("url");
            Statement statement = conn.createStatement();
            String query = "select * from student ORDER BY stuclass DESC,number ASC";
            ResultSet rs = statement.executeQuery(sql);
            out.println("<table border=1>");
            out.println("<th colspan=4 style = 'font-size:x-large;alignment;center>学生信息表</th>");
            out.println("<tr style='text-align:center;'>");
            out.println("<td>学号</td> <td>姓名</td> <td>出生日期</td> <td>所在班级</td> </tr>");
            while (rs.next()){
                out.println("<tr style='text-align:center;'>");
                out.println("<td>"+rs.getString(1)+"</td>");a
                out.println("<td>"+rs.getString(2)+"</td>");
                out.println("<td>" +rs.getString("birthday")+"</td>");
                out.println("<td>" +rs.getString("stucalss")+"</td>");
                out.println("</tr>");
            }
            out.println("</table> </body>");
        }catch (Exception e){
            e.printStackTrace();
        }
        out.flush();
        out.close();
    }
}
